I have tried to purge mysql and then reinstall it (sudo apt-get purge mysql-server mysql-client mysql-common mysql-server-5.6 ), but it does not work. It looks like a dependency issue. Here is the log:

Preparing to unpack .../mysql-server-5.6_5.6.27-0ubuntu1_amd64.deb ... Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 7. Use of uninitialized value $val in substitution (s///) at /usr/share/perl5/Debconf/Format/822.pm line 83, <GEN7> line 1. Use of uninitialized value $val in concatenation (.) or string at /usr/share/perl5/Debconf/Format/822.pm line 84, <GEN7> line 1. Unpacking mysql-server-5.6 (5.6.27-0ubuntu1) ... Selecting previously unselected package mysql-server. Preparing to unpack .../mysql-server_5.6.27-0ubuntu1_all.deb ... Unpacking mysql-server (5.6.27-0ubuntu1) ... Processing triggers for man-db (2.7.4-1) ... Processing triggers for systemd (225-1ubuntu9) ... Processing triggers for ureadahead (0.100.0-19) ... ureadahead will be reprofiled on next reboot Setting up libmysqlclient18:amd64 (5.6.27-0ubuntu1) ... Setting up libdbd-mysql-perl (4.028-2) ... Setting up mysql-client-core-5.6 (5.6.27-0ubuntu1) ... Setting up mysql-client-5.6 (5.6.27-0ubuntu1) ... Setting up mysql-server-core-5.6 (5.6.27-0ubuntu1) ... Setting up mysql-server-5.6 (5.6.27-0ubuntu1) ... Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 7. update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode Job for mysql.service failed because a timeout was exceeded. See "systemctl status mysql.service" and "journalctl -xe" for details. invoke-rc.d: initscript mysql, action "start" failed. dpkg: error processing package mysql-server-5.6 (--configure): subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of mysql-server: mysql-server depends on mysql-server-5.6; however: Package mysql-server-5.6 is not configured yet. dpkg: error processing package mysql-server (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Processing triggers for libc-bin (2.21-0ubuntu4) ... Processing triggers for systemd (225-1ubuntu9) ... Processing triggers for ureadahead (0.100.0-19) ... Errors were encountered while processing: mysql-server-5.6 mysql-serverError in function: Setting up mysql-server-5.6 (5.6.27-0ubuntu1) ... Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 7. Job for mysql.service failed because a timeout was exceeded. See "systemctl status mysql.service" and "journalctl -xe" for details. invoke-rc.d: initscript mysql, action "start" failed. dpkg: error processing package mysql-server-5.6 (--configure): subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of mysql-server: mysql-server depends on mysql-server-5.6; however: Package mysql-server-5.6 is not configured yet. dpkg: error processing package mysql-server (--configure): dependency problems - leaving unconfigured

And then when I ran systemctl status mysql.service it outputted:

● mysql.service - MySQL Community Server Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled) Active: activating (start-post) since Mon 2015-11-23 19:37:19 EST; 1min 3s ago Process: 16210 ExecStart=/usr/bin/mysqld_safe (code=exited, status=0/SUCCESS) Process: 16207 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS) Main PID: 16210 (code=exited, status=0/SUCCESS); : 16211 (mysql-systemd-s) CGroup: / └─control ├─16211 /bin/bash /usr/share/mysql/mysql-systemd-start post |─16781 sleep 1

Inputting journalctrl -xe spits out:

-- The start-up result is done. Nov 23 19:37:18 khantop systemd[1]: Reloading. Nov 23 19:37:19 khantop systemd[1]: Started CUPS Scheduler. -- Subject: Unit cups.service has finished start-up -- Defined-By: systemd -- Support: -- -- Unit cups.service has finished starting up. -- -- The start-up result is done. Nov 23 19:37:19 khantop systemd[1]: Starting MySQL Community Server... -- Subject: Unit mysql.service has begun start-up -- Defined-By: systemd -- Support: -- -- Unit mysql.service has begun starting up. Nov 23 19:37:19 khantop mysqld_safe[16210]: 151123 19:37:19 mysqld_safe Can't log to error log and syslog at the same time. Remove all --log-e Nov 23 19:37:19 khantop mysqld_safe[16210]: 151123 19:37:19 mysqld_safe Logging to '/var/log/mysql/error.log'. Nov 23 19:37:19 khantop mysqld_safe[16210]: 151123 19:37:19 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql Nov 23 19:37:19 khantop audit[16560]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/etc/my.cnf" pid=16560 comm="mysq Nov 23 19:37:19 khantop kernel: audit: type=1400 audit(1448325439.865:57): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name=" Nov 23 19:37:20 khantop mysqld_safe[16210]: 151123 19:37:20 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended Nov 23 19:39:01 khantop CRON[16894]: pam_unix(cron:session): session opened for user root by (uid=0) Nov 23 19:39:01 khantop CRON[16895]: (root) CMD ( [ -x /usr/lib/php5/sessionclean ] && /usr/lib/php5/sessionclean) Nov 23 19:39:01 khantop CRON[16894]: pam_unix(cron:session): session closed for user root Nov 23 19:41:09 khantop AptDaemon[5352]: INFO: Quitting due to inactivity Nov 23 19:41:09 khantop AptDaemon[5352]: INFO: Quitting was requested Nov 23 19:41:09 khantop org.debian.apt[607]: 19:41:09 AptDaemon [INFO]: Quitting due to inactivity Nov 23 19:41:09 khantop org.debian.apt[607]: 19:41:09 AptDaemon [INFO]: Quitting was requested Nov 23 19:41:09 khantop dbus[607]: [system] Activating service name='org.debian.apt' (using servicehelper) Nov 23 19:41:11 khantop AptDaemon[17305]: INFO: Initializing daemon Nov 23 19:41:11 khantop org.debian.apt[607]: 19:41:11 AptDaemon [INFO]: Initializing daemon Nov 23 19:41:11 khantop dbus[607]: [system] Successfully activated service 'org.debian.apt' Nov 23 19:41:11 khantop AptDaemon.PackageKit[17305]: INFO: Initializing PackageKit compat layer Nov 23 19:41:11 khantop org.debian.apt[607]: 19:41:11 AptDaemon.PackageKit [INFO]: Initializing PackageKit compat layer

Is it because 15.10 is not officially supported by MSQL? Thank you to anyone who takes their time to help me out!

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